Even beyond the war crimes; just the wars themselves. The WMD thing in Iraq is nice because not only was the war flimsily justified, but that justification itself was a lie.

However, a lot of the other wars are just bizarre. Taking Afghanistan - the costs, suffering caused and damage to the global economy are completely absurd. Nothing was achieved. There isn't any reason for someone in the US to even feel better after that debacle. The decision makers had to know that was what they were triggering, they did it anyway and many of them are still treated like reasonable choices for leadership positions.

That decision making was worse than anything Russia or China did, it was just pointless killing and destruction.